ext: mcux: Adapt ksdk 1.3 for kw40z to work with mcux 2.x drivers

Reuses the kw41z clock driver for kw40z via preprocessor includes.
Copies the kw41z fsl_device_registers.h to kw40z and subset devices with
minor modifications for each device.

Jira: ZEP-1388
Change-Id: Ifae16eb9b7e7d18fc13c22dc51887fc1d8a5e21d
Signed-off-by: Maureen Helm <maureen.helm@nxp.com>